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CVE-2026-62437— x86: DMs may cause mem leak by IRQ binding

Quick assessment

Affected
Xen Xen
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Xen是Xen组织开源的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上,并支持在运行时进行迁移,保证正常运行并且避免宕机。 Xen存在安全漏洞，该漏洞源于终止guest时PCI设备及相关IRQ跟踪结构的清理过早，导致guest可通过设备模型重新绑定IRQ，使部分跟踪结构无法被清理。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.10% · P1

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 1

VendorProduct Version RangeStatus
Xen Xen consult Xen advisory XSA-509 unknown
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I. Basic Information for CVE-2026-62437

Vulnerability Information
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Vulnerability Title
x86: DMs may cause mem leak by IRQ binding
Source: CVE Program / CVE List V5
Vulnerability Description
When guests are terminated, various pieces of cleanup need carrying out. The cleaning up of PCI devices which were assigned to guests, and the associated removal of tracking structures for IRQs used by the devices occurs relatively early in the process. Unfortunately after that point the guest about to be terminated could cause its device model (DM) to re-establish such tracking structures, by having it bind one or more IRQs anew. While some of those tracking structures would still be cleaned up later on, at least one would not be.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Xen 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Xen是Xen组织开源的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上,并支持在运行时进行迁移,保证正常运行并且避免宕机。 Xen存在安全漏洞，该漏洞源于终止guest时PCI设备及相关IRQ跟踪结构的清理过早，导致guest可通过设备模型重新绑定IRQ，使部分跟踪结构无法被清理。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Xen Xen consult Xen advisory XSA-509 -

II. Public POCs for CVE-2026-62437

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III. Intelligence Information for CVE-2026-62437

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Vendor Advisories for CVE-2026-62437 (1)

Same Patch Batch · Xen · 2026-09-08 · 3 CVEs total

CVE-2026-79603 Unconditionally do TLB flushing ahead of page scrubbing
CVE-2026-79602 x86: improper handling of HVM emulation return codes

IV. Related Vulnerabilities

Same product: Xen
Same vendor: Xen

V. Comments for CVE-2026-62437

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